Recommendation Q.2965.1 (03/99) covers the support of quality of service classes in a B-ISDN. This amendment of Recommendation Q.2965.1 has been prepared to provide alignment with the third edition of Recommendation I.356 (2000). In particular, this amendment allows the support of explicit signalling of the I.356 QoS class 5 in addition to the capabilities already provided in Recommendation Q.2965.1 (1999).